In the Old Testament - The Sabbath was God's requirement for both The Land and the Nation of Israel to receive REST from their work to worship God and enjoy His provision, be refreshed and restored but also as a witness to the surrounding Nations of God's ways and how He cares for what and those who belong to Him. God was teaching them to trust that when their worked stopped -That He had and would continue to provide for them. They then could use the time to focus on Him, enjoy His goodness and celebrate with each other.
For the Land - It was a 1 year rest after six years of being worked.
For the People - It was 1 day rest after six days of their work.
In the New Testament - Christ Jesus NOW becomes our Sabbath rest "continually" (not just 1 day) but forever. We NOW are to cease from all of our works not just once a week but are to learn to trust in His provision at all times. We NOW are to live by FAITH not by sight and not rely upon our own works or understanding. We are NOW to focus on Him and celebrate His goodness with each other continually. Why ? Because in Christ we are to remain at rest continually (cease from our work) to serve Him only as a witness to the unbelievers that God means what He says, His promises are true and that He will provide for all of our needs if we belong to Him.
God's ways and our ways are NOT the same. If you are NOW Born Again into God's Family through Jesus Christ your life NOW is to be a life of Faith, trusting in the "finished work" of Jesus, obeying His teachings and "Resting" in the promise that He is our Sabbath and all that it implies (it's benefits) to Those who enter into HIS REST - NOW.
When God Rested on the seventh day from His work - that "day" was considered "Holy" unto God who is HOLY-Holy-Holy.
Our rest in Christ, our Sabbath, is to be continually Holy unto God by abiding in Christ Jesus at all times and not just once a week but in continual service unto God. This is NOW our REST and also our witness of God's WAY of FAITH - receiving all His provision Not by the work of men but by the FINISHED work of Christ Jesus - who is LORD of all.
For all the promises of God find their Yes in Him. That is why it is through Him that we utter our Amen to God for his glory. (2 Corinthians 1:20)